SIP (Session Initiation Protocol, RFC ) is a text-based application in the SIP specification (RFC ) to locate the proper resource in the network. RFC Client-Initiated Connections in SIP October the Trust Legal .. flow, instead of resolving the Contact URI using the procedures in [RFC] and . Canonical URL: ; File formats: Plain Text PDF Discuss this RFC: Send questions or comments to [email protected]
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In the IMS every user agent is served by its P-CSCF, which is discovered by using the Dynamic Host Configuration Protocol or an equivalent mechanism when the user enters the IMS network, and all requests and responses from or to the user agent must traverse this proxy.
ITU-T work programme
Apart from all the explained extensions to SIP that make it possible for the IMS to work successfully, it is also necessary that the IMS framework interworks and exchanges services with existing network infrastructures, mainly the Public switched telephone network PSTN. The reliability of provisional responses extension  provides a mechanism to confirm that provisional responses such as the Ringing response codethat lets the caller know that the callee is being alerted, are idtf received.
Current information, if any, about IPR issues:. Moreover, event notification can uetf used to provide additional services such as voicemail i. SIP is an exceptionally popular and extensible protocol.
Technical Product Description
Session Initiation Protocol 2. Session Initiation Protocol v1.
In cases where specifications are part of a larger release plan, as with the 3GPP, Ietc prioritizes compliance with the latest ratified release in this case, Release 6.
From Wikipedia, the free encyclopedia. Event notification is necessary in the Rf framework to inform about the presence of a user i. This way the recipient of the message can decide whether or not to follow the reference to fetch the resource, depending on the bandwidth available. Comments on RFCs and corresponding changes are accommodated through the existing standardization process.
Retrieved December 1, Retrieved 15 November The functionality of sending instant messages to provide a service similar to text messaging is defined in the instant messaging extension. Current information, if any, about IPR issues: Other for any supplementary information: To indicate so, they iietf insert the privacy token id into the Privacy header field. Stream Control Transmission Protocol. Retrieved November 15, In the IMS it is possible for a user to have multiple terminals e.
This can be used to negotiate and allocate the call resources before the called party iett alerted.
Yes —Indicates that Oracle Communications Converged Application Server container directly supports the feature or specification. Retrieved November 29, Oracle Communications Converged Application Server does not enforce the requirement that only oetf p-charging-function-address header per SIP request as described in sub-section 5.
SIP extensions for the IP Multimedia Subsystem – Wikipedia
However, in such an scenario as the IMS framework, it is necessary to extend this reliability to provisional responses to INVITE requests for session establishment, this is, to start a call. To this end, the specific event notification extension  defines a framework for event notification in SIP, with two new methods: PRACK, which is the request message used to tell the sender of a provisional response that his or her message has been received.
Retrieved December 2, This rcf was last edited on 10 Septemberat In SIP, the route header field, filled by the sender, supports this functionality by listing a set of proxies the message will visit.
They were designed specifically to meet the 3GPP requirements because a more general solution was not available. With the caller preferences extension,  the calling party is able to indicate the kind of user agent they want to reach e.
Oracle Communications Converged Ieyf Server supports applications that conform to this specification.
PUBLISH, which is used to request the publication of the state of the resource specified in the request-URI, with reference to the event stated in the Event headerand with the information carried in the message body. There is a mechanism  to indicate that rcf SIP message is desired to be compressed.
The state publication framework defines a new method: There is also an allow-events header to indicate event notification capabilities, and the accepted and bad event response codes to indicate if a subscription request has been preliminary accepted or has been turned down because the notifier does not understand the kind of event requested.
These two extensions allow users to specify their preferences about the service the IMS provides. They are commonly obtained during the registration process: The security mechanisms agreement extension for SIP  was then introduced to provide a secure mechanism for negotiating the security algorithms and parameters to be used by the P-CSCF and the terminal.